<!DOCTYPE html>
<html lang="en">

<head>
    <title>H5单页面手势滑屏切换</title>
    <meta name="viewport" charset="utf-8" content="width=device-width,initial-scale=1.0,maximum-scale=1.0,minimum-scale=1.0,user-scalable=1.0">
    <!--<link rel="stylesheet" href="dist/app.css">-->
    <!--<script src="js/app.js"></script>-->
    <style>

        .viewport {
            width: 2720px;
            height:788px;
            display: -webkit-box;
            pointer-events: none;
            -webkit-transform: translate3d(0, 0, 0);
            backface-visibility: hidden
        }

        .pageview {
            -webkit-box-flex: 1;
            width: 0
        }

        .pagenumber {
            display: -webkit-box;
            position: absolute;
            bottom: 2em;
            left: 35%;
            height: 2em;
            width: 30%
        }

        .pagenumber div {
            -webkit-box-flex: 1;
            width: 0;
            position: relative
        }

        .pagenumber .now:after {
            background: rgba(255, 255, 255, 1)!important
        }

        .pagenumber div:after {
            content: "";
            width: .4em;
            height: .4em;
            background: rgba(255, 255, 255, .5);
            border-radius: 2em;
            position: absolute;
            top: 50%;
            left: 50%;
            margin-top: -.2em;
            margin-left: -.2em
        }

        h3 {
            text-align: center;
            font-family: Microsoft YaHei, Arial;
            color: #000;
            font-size: 1.7em;
            font-weight: 400;
            padding: 1em 0;
            margin: 0
        }

        /*@media screen and (max-width:360px) {*/
            /*body,*/
            /*html {*/
                /*font-size: 15px*/
            /*}*/
        /*}*/

        /*@media screen and (min-width:360px) and (max-width:400px) {*/
            /*body,*/
            /*html {*/
                /*font-size: 16px*/
            /*}*/
        /*}*/

        /*@media screen and (min-width:400px) and (max-width:460px) {*/
            /*body,*/
            /*html {*/
                /*font-size: 18px*/
            /*}*/
        /*}*/

        /*@media screen and (min-width:460px) {*/
            /*body,*/
            /*html {*/
                /*font-size: 24px*/
            /*}*/
        /*}*/
    </style>
</head>

<body>
<div id="viewport" class="viewport">
    <div class="pageview" >
        <img src="img/phone/1.png">
    </div>
    <div class="pageview" >
        <img src="img/phone/2.png">
    </div>
    <div class="pageview">
        <img src="img/phone/3.png">
    </div>
    <div class="pageview" >
        <img src="img/phone/4.png">
    </div>
</div>
<div class="pagenumber">
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
</div>
<script>
    (function(window,document){
        var currentPosition = 0; //记录当前页面位置
        var currentPoint = -1;   //记录当前点的位置
        var pageNow = 1;   //当前页码
        var points = null; //页码数

        var app = {
            init:function(){
                //否则只能在手机上运行
//         if(/(windows)/i.test(navigator.userAgent)){
//             location.href = 'views/pc.html';
//         }
                document.addEventListener('DOMContentLoaded',function(){
                    points = document.querySelectorAll('.pagenumber div') ;
                    app.bindTouchEvent(); //绑定触摸事件
                    app.setPageNow();     //设置初始页码
                }.bind(app),false);
            }(),

            //页面平移
            transform:function(translate){
                this.style.webkitTransform = "translate3d("+translate+"px,0,0)";
                currentPosition = translate;
            },

            /**
             * 设置当前页码
             */
            setPageNow:function(){
                if (currentPoint != -1){
                    points[currentPoint].className = '';
                }
                currentPoint = pageNow - 1;
                points[currentPoint].className = 'now';
            },

            /**
             * 绑定触摸事件
             */
            bindTouchEvent:function(){
                var viewport =  document.querySelector('#viewport');
                var pageWidth = 544; //页面宽度
                var maxWidth = - pageWidth * (points.length-1); //页面滑动最后一页的位置
                var startX,startY;
                var initialPos = 0;  // 手指按下的屏幕位置
                var moveLength = 0;  // 手指当前滑动的距离
                var direction = "left"; //滑动的方向
                var isMove = false; //是否发生左右滑动
                var startT = 0; //记录手指按下去的时间

                /*手指按下时*/
                document.addEventListener("touchstart",function(e){
                    e.preventDefault();
                    var touch = e.touches[0];
                    startX = touch.pageX;
                    startY = touch.pageY;
                    initialPos = currentPosition;   //本次滑动前的初始位置
                    viewport.style.webkitTransition = ""; //取消动画效果
                    startT = new Date().getTime(); //记录手指按下的开始时间
                    isMove = false;
                }.bind(this),false);

                /*手指在屏幕上滑动，页面跟随手指移动*/
                document.addEventListener("touchmove",function(e){
                    e.preventDefault();
                    var touch = e.touches[0];
                    var deltaX = touch.pageX - startX;
                    var deltaY = touch.pageY - startY;
                    //如果X方向上的位移大于Y方向，则认为是左右滑动
                    if (Math.abs(deltaX) > Math.abs(deltaY)){
                        moveLength = deltaX;
                        var translate = initialPos + deltaX; //当前需要移动到的位置
                        //如果translate>0 或 < maxWidth,则表示页面超出边界
                        if (translate <=0 && translate >= maxWidth){
                            this.transform.call(viewport,translate);
                            isMove = true;
                        }
                        direction = deltaX>0?"right":"left"; //判断手指滑动的方向
                    }
                }.bind(this),false);

                /*手指离开屏幕时，计算最终需要停留在哪一页*/
                document.addEventListener("touchend",function(e){
                    e.preventDefault();
                    var translate = 0;
                    //计算手指在屏幕上停留的时间
                    var deltaT = new Date().getTime() - startT;
                    if (isMove){ //发生了左右滑动
                        //使用动画过渡让页面滑动到最终的位置
                        viewport.style.webkitTransition = "0.3s ease -webkit-transform";
                        if(deltaT < 300){ //如果停留时间小于300ms,则认为是快速滑动，无论滑动距离是多少，都停留到下一页
                            translate = direction == 'left'?
                            currentPosition-(pageWidth+moveLength):currentPosition+pageWidth-moveLength;
                            //如果最终位置超过边界位置，则停留在边界位置
                            translate = translate > 0 ? 0 : translate; //左边界
                            translate = translate < maxWidth ? maxWidth : translate; //右边界
                        }else {
                            //如果滑动距离小于屏幕的50%，则退回到上一页
                            if (Math.abs(moveLength)/pageWidth < 0.5){
                                translate = currentPosition-moveLength;
                            }else{
                                //如果滑动距离大于屏幕的50%，则滑动到下一页
                                translate = direction == 'left'?
                                currentPosition-(pageWidth+moveLength):currentPosition+pageWidth-moveLength;
                                translate = translate > 0 ? 0 : translate;
                                translate = translate < maxWidth ? maxWidth : translate;
                            }
                        }
                        //执行滑动，让页面完整的显示到屏幕上
                        this.transform.call(viewport,translate);
                        //计算当前的页码
                        pageNow = Math.round(Math.abs(translate) / pageWidth) + 1;

                        setTimeout(function(){
                            //设置页码，DOM操作需要放到子线程中，否则会出现卡顿
                            this.setPageNow();
                        }.bind(this),100);
                    }
                }.bind(this),false);
            }
        }
    })(window,document);
</script>
</body>

</html>